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Orange County Architectural Renovations Smith Sinnett / 2023036 <br />Hillsborough, NC Orange County Asset Management Services <br />ALUMINUM-FRAMED ENTRANCES AND STOREFRONTS08 41 13 - 2 <br />1. Deflection Normal to Wall Plane: Limited to edge of glass in a direction perpendicular to glass plane shall not <br />exceed L/175 of the glass edge length for each individual glazing lite or an amount that restricts edge deflection of <br />individual glazing lites to 3/4 inch, whichever is less. <br />2. Deflection Parallel to Glazing Plane: Limited to amount not exceeding that which reduces glazing bite to less than <br />75 percent of design dimension and that which reduces edge clearance between framing members and glazing or <br />other fixed components directly below them to less than 1/8 inch and clearance between members and operable <br />units directly below them to less than 1/16 inch. <br />D. Structural-Test Performance: Provide aluminum-framed systems tested according to ASTM E 330 as follows: <br />1. When tested at positive and negative wind-load design pressures, systems do not evidence deflection exceeding <br />specified limits. <br />2. When tested at 150 percent of positive and negative wind-load design pressures, systems, including anchorage, do <br />not evidence material failures, structural distress, and permanent deformation of main framing members exceeding <br />0.2 percent of span. <br />3. Test Durations: As required by design wind velocity, but not fewer than 10 seconds. <br />E. Air Infiltration: Provide aluminum-framed systems with maximum air leakage through fixed glazing and framing areas of <br />0.06 cfm/sq. ft. of fixed wall area when tested according to ASTM E 283 at a minimum static-air-pressure difference of 1.57 <br />lbf/sq. ft.. <br />F. Water Penetration under Static Pressure: Provide aluminum-framed systems that do not evidence water penetration through <br />fixed glazing and framing areas when tested according to ASTM E 331 at a minimum static-air-pressure difference of 20 <br />percent of positive wind-load design pressure, but not less than 6.24 lbf/sq. ft.. <br />G. Water Penetration under Dynamic Pressure: Provide aluminum-framed systems that do not evidence water leakage through <br />fixed glazing and framing areas when tested according to AAMA 501.1 under dynamic pressure equal to 20 percent of <br />positive wind-load design pressure, but not less than 6.24 lbf/sq. ft.. <br />1. Maximum Water Leakage: No uncontrolled water penetrating aluminum-framed systems or water appearing on <br />systems’ normally exposed interior surfaces from sources other than condensation. Water leakage does not include <br />water controlled by flashing and gutters that is drained to exterior and water that cannot damage adjacent materials <br />or finishes. <br />H. Thermal Movements: Provide aluminum-framed systems that allow for thermal movements resulting from the following <br />maximum change (range) in ambient and surface temperatures. Base engineering calculation on surface temperatures of <br />materials due to both solar heat gain and nighttime-sky heat loss. <br />1. Temperature Change (Range): 120 deg F, ambient; 180 deg F, material surfaces. <br />2. Test Performance: No buckling; stress on glass; sealant failure; excess stress on framing, anchors, and fasteners; or <br />reduction of performance when tested according to AAMA 501.5. <br />a. High Exterior Ambient-Air Temperature: That which produces an exterior metal-surface temperature of <br />180 deg F. <br />b. Low Exterior Ambient-Air Temperature: 0 deg F. <br />3. Interior Ambient-Air Temperature: 75 deg F. <br />I. Condensation Resistance: Provide aluminum-framed systems with fixed glazing and framing areas having condensation- <br />resistance factor (CRF) of not less than 45 when tested according to AAMA 1503. <br />J. Thermal Conductance: Provide aluminum-framed systems with fixed glazing and framing areas having an average U-factor <br />of not more than 0.57 Btu/sq. ft. x h x deg F when tested according to AAMA 1503. <br />K. Structural Sealant: Capable of withstanding tensile and shear stresses imposed by aluminum-framed systems without failing <br />adhesively or cohesively. When tested for preconstruction adhesion and compatibility, cohesive failure of sealant shall <br />occur before adhesive failure. <br />1. Adhesive failure occurs when sealant pulls away from substrate cleanly, leaving no sealant material behind. <br />2. Cohesive failure occurs when sealant breaks or tears within itself but does not separate from each substrate because <br />sealant-to-substrate bond strength exceeds sealant’s internal strength. <br />L. Structural-Sealant Joints: Designed to produce tensile or shear stress of less than 20 psi. <br />Docusign Envelope ID: 52FACC74-DA96-491B-B0B8-04AC3961737D